Beluga Stomach With Clean pepper

This is an excerpt from The Prince of Transylvania's Court Cookbook(Hungary, 16th c.)
The original source can be found at
MedievalCookery.com

Beluga stomach with clean pepper. Boil it and prepare the sauce like I told you. Boil the stomach, pass through a strainer the water, cut it so that every foul thing will come out. Slice the stomach like you'd slice a cow's, add some salt, and when you're about to cook it, wash it from the salt and put it in water. Cook the stomach thoroughly, for this takes about the same time it'd take to cook a calf.